Write output in subdirectory FV3ATM_OUTPUT/

[aerorahul]

Description

The write grid component model output is controlled via model_configure. Specifically, this line in model_configure is used to generate the atm and sfc files:

filename_base: 'atm' 'sfc'

By default, this output of atmf000.nc, atmf003.nc, ... and, sfcf000.nc, sfcf003.nc, ... are created at the root of the run directory.
The FV3ATM component also allows the running of inline UPP. Inline-post produces GFSPRS.FHH and GFSFLX.FHH files.

This issue requests a feature so that this output can be created under a sub-directory e.g. FV3ATM_OUTPUT/. Doing so has several advantages:

• At long forecast hours, the output volume overwhelms the run directory and saving output in a component specific sub-directory will aid in better organizing data and diagnosing issues in the event of model failures
• The workflows can redirect these output to a common path allowing restart capabilities from failure to continue.
• The FV3 output will be consistent w/ other components e.g. MOM6 and CICE6 that allow placing their output in similar sub-directories MOM6_OUTPUT/ and CICE_OUTPUT/. These paths are namelist controlled and the defaults are ./

Solution

Allow FV3 output from the write grid component be created under FV3ATM_OUTPUT/ (or some path) controlled via namelist or model_configure.

Alternatives

I created a sub-directory named FV3ATM_OUTPUT/ in the run directory and then I tried the following in model_configure:

filename_base: 'FV3ATM_OUTPUT/atm' 'FV3ATM_OUTPUT/sfc'

The model failed to in the IO component.

This would not solve the inline post output part of the issue.

Testing:

• Will the baseline results change? No. Baselines should not change due to change in output path

Dependent PRs:

May need a change in UPP to allow placing of GFSPRS and GFSFLX files in sub-directory.

[DusanJovic-NOAA]

Please take a look at this branch (https://github.com/DusanJovic-NOAA/fv3atm/tree/fv3atm_output_dir) and test it to make sure everything works as expected. Corresponding ufs-weather-model branch is https://github.com/DusanJovic-NOAA/ufs-weather-model/tree/fv3atm_output_dir

[aerorahul]

Thanks @DusanJovic-NOAA
I will give this a try ASAP in the atm-only mode, however, we won't be able to use this until some other issues in the model/workflow get sorted out.